current_depth = title.depth;
The engine is ~2,100 lines of pure TeX code in a single file (chess-engine.tex). Everything happens during pdflatex compilation. Here is the high-level architecture:。关于这个话题，搜狗浏览器提供了深入分析
(let* ((acceptor (hunchentoot:taskmaster-acceptor taskmaster))，更多细节参见okx
Double-buffered sentence-level synthesis and playback，这一点在官网中也有详细论述